readme.md

Wouldn't it be nice to have a revision history for any model in your project, without having to do any work for it. By simply adding the RevisionableTrait Trait to your model, you can instantly have just that, and be able to display a history similar to this:

Chris changed title from 'Something' to 'Something else'

Chris changed category from 'News' to 'Breaking news'

Matt changed category from 'Breaking news' to 'News'

So not only can you see a history of what happened, but who did what, so there's accountability.

Revisionable is a laravel package that allows you to keep a revision history for your models without thinking. For some background and info, see this article

Finally, you'll also need to run migration on the package (Laravel 5.x)

php artisan migrate

For Laravel 4.x users:

php artisan migrate --package=venturecraft/revisionable

If you're going to be migrating up and down completely a lot (using migrate:refresh), one thing you can do instead is to copy the migration file from the package to your app/database folder, and change the classname from CreateRevisionsTable to something like CreateRevisionTable (without the 's', otherwise you'll get an error saying there's a duplicate class)

Being a trait, Revisionable can now be used with the standard Eloquent model, or any class that extends Eloquent, such as Ardent.

Legacy class based implementation

The new trait based approach is backwards compatible with existing installations of Revisionable. You can still use the below installation instructions, which essentially is extending a wrapper for the trait.

For any model that you want to keep a revision history for, include the VentureCraft\Revisionable namespace and use the RevisionableTrait in your model, e.g.,

Implementation notes

If needed, you can disable the revisioning by setting $revisionEnabled to false in your Model. This can be handy if you want to temporarily disable revisioning, or if you want to create your own base Model that extends Revisionable, which all of your models extend, but you want to turn Revisionable off for certain models.

In order to maintain a limit on history, but instead of stopping tracking revisions if you want to remove old revisions, you can accommodate that feature by setting $revisionCleanup.

namespaceApp;use\Venturecraft\Revisionable\RevisionableTrait;classArticleextends\Illuminate\Database\Eloquent\Model {protected$revisionEnabled=true;protected$revisionCleanup=true; //Remove old revisions (works only when used with $historyLimit)protected$historyLimit=500; //Maintain a maximum of 500 changes at any point of time, while cleaning up old revisions.}

Storing Soft Deletes

By default, if your model supports soft deletes, Revisionable will store this and any restores as updates on the model.

You can choose to ignore deletes and restores by adding deleted_at to your $dontKeepRevisionOf array.

To better format the output for deleted_at entries, you can use the isEmpty formatter (see Format output for an example of this.)

Storing Creations

By default the creation of a new model is not stored as a revision.
Only subsequent changes to a model is stored.

If you want to store the creation as a revision you can override this behavior by setting revisionCreationsEnabled to true by adding the following to your model:

protected$revisionCreationsEnabled=true;

More Control

No doubt, there'll be cases where you don't want to store a revision history only for certain fields of the model, this is supported in two different ways. In your model you can either specifiy which fields you explicitly want to track and all other fields are ignored:

protected$keepRevisionOf= ['title'];

Or, you can specify which fields you explicitly don't want to track. All other fields will be tracked.

protected$dontKeepRevisionOf= ['category_id'];

The $keepRevisionOf setting takes precedence over $dontKeepRevisionOf

Events

Every time a model revision is created an event is fired. You can listen for revisionable.created,revisionable.saved or revisionable.deleted.

This comes into play when you output the revision field name using $revision->fieldName()

String

To format a string, simply prefix the value with string: and be sure to include %s (this is where the actual value will appear in the formatted response), e.g.,

string:<strong>%s</strong>

Boolean

Booleans by default will display as a 0 or a 1, which is pretty bland and won't mean much to the end user, so this formatter can be used to output something a bit nicer. Prefix the value with boolean: and then add your false and true options separated by a pipe, e.g.,

boolean:No|Yes

DateTime

DateTime by default will display as Y-m-d H:i:s. Prefix the value with datetime: and then add your datetime format, e.g.,

datetime:m/d/Y g:i A

Is Empty

This piggy backs off boolean, but instead of testing for a true or false value, it checks if the value is either null or an empty string.

isEmpty:No|Yes

This can also accept %s if you'd like to output the value, something like the following will display 'Nothing' if the value is empty, or the actual value if something exists:

isEmpty:Nothing|%s

Load revision history

To load the revision history for a given model, simply call the revisionHistory method on that model, e.g.,

$article=Article::find($id);$history=$article->revisionHistory;

Displaying history

For the most part, the revision history will hold enough information to directly output a change history, however in the cases where a foreign key is updated we need to be able to do some mapping and display something nicer than plan_id changed from 3 to 1.

To help with this, there's a few helper methods to display more insightful information, so you can display something like Chris changed plan from bronze to gold.

userResponsible()

Returns the User that was responsible for making the revision. A user model is returned, or null if there was no user recorded.

The user model that is loaded depends on what you have set in your config/auth.php file for the model variable.

fieldName()

Returns the name of the field that was updated, if the field that was updated was a foreign key (at this stage, it simply looks to see if the field has the suffix of _id) then the text before _id is returned. e.g., if the field was plan_id, then plan would be returned.

Remember from above, that you can override the output of a field name with the $revisionFormattedFieldNames array in your model.

identifiableName()

This is used when the value (old or new) is the id of a foreign key relationship.

By default, it simply returns the ID of the model that was updated. It is up to you to override this method in your own models to return something meaningful. e.g.,

oldValue() and newValue()

Get the value of the model before or after the update. If it was a foreign key, identifiableName() is called.

Unknown or invalid foreign keys as revisions

In cases where the old or new version of a value is a foreign key that no longer exists, or indeed was null, there are two variables that you can set in your model to control the output in these situations: